As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE FOUND LT AFT CABIN SHEAR PLATE SUPPORT LOWER SURFACE HAS CORROSION AT CLIP NUT ATTACHMENT FRAME 69-70. R & R LT AFT CABIN SHEAR PLATE SUPPORT FRAME 69-70 IAW SRM 51-42-11. THIS ITEM HAS BEEN CLASSIFIED AS A LEVEL 2 CORROSION.